rdma: fix rdma-core install
rdma: fix rdma-core install

We should not install symlinks to local build directory.

Type: fix

Change-Id: I81e624dd5775ec9c5dd8c58f578ee51c5acfef73
Signed-off-by: Benoît Ganne <38aad8ffcfa407b890d258e568f161530f66882d@cisco.com>

FDio/vpp,chrisy/vpp,chrisy/vpp,chrisy/vpp,FDio/vpp,chrisy/vpp,FDio/vpp,FDio/vpp,chrisy/vpp,FDio/vpp,chrisy/vpp,FDio/vpp,chrisy/vpp,chrisy/vpp,FDio/vpp,FDio/vpp